Thread braking device for use in connection with ring spinning and twisting machines



Sept. 24, 1963 c. SCHLDESSER 3,104,514

THREAD BRAKING DEVICE FOR USE IN CONNECTION WITH RING SPINNING ANDTWISTING MACHINES Filed Oct. 9, 1961 l I 2 Q FIG! INVENTOR BY 1; W

United States Patent THREAD BRAKING DEVICE FOR USE IN CON- NECTIGN WITHRING SPINNDIG AND TWIST- ING MACHINES Clemens Schliiesser, Bremen,Germany, assignor to Spinnbau G.m.b.H., Bremen-Farge, Germany Filed Oct.9, 1961, Serial No. 143,944 Claims priority, application Germany Oct. 7,1960 7 Claims. (Cl. 5773) The present invention relates to a threadbraking device for use in connection with textile machines, and, morespecifically, to a thread braking device arranged at the head of thespindles of ring spinning and ring twisting machines for rotation withthe spindles, while having a carrier crown for the thread by means ofwhich a helical path of the thread from the crown to the traveler willbe effected.

With heretofore known braking devices, the thread was guided by carrieror frictional surfaces in such a way that the thread formed helicalwindings around the spindle and the bobbin sleeve while engaging thesame. In this way, a more or less ascending thread coil up to thetraveler was obtained, and this process was termed balloon-free spinningor spinning with omitted balloon.

The heretofore known braking devices of this type have, in practice,proved defective for the following reasons:

First: In view of the helical looping of the thread around the spindleand the bobbin sleeve, the thread continuously slides over the uppersleeveedge and over a portion of the surface of the bobbin sleeve. Forthis reason, the bobbin sleeve, and in particular, the upper sleeve edgemust be smooth and free from defects, otherwise a thread break isunavoidable. Therefore, in order to prevent such thread break as far aspossible, the upper sleeve edge has to be provided with a smooth coveror sleeve protector, and it is necessary to handle the bobbin sleeveextremely carefully.

Second: In view of the lack of a thread balloon, the jumping or leapingof the thread spreads from one carrier of the brake to the other up tothe traveler whereby the traveler likewise jumps and leaps, which, inturn, again may cause thread breaks in view of the fact that the tensioncompensating efiect of the thread balloon is lacking.

Third: When underwinding the toll bobbin sleeve, great difficulties areencountered because the helical thread loop has frequently to engage theyarn body, which brings about frequent thread breaks.

It is also known to arrange an additional traveler above the spindle andto provide the spindle with an extension comprising two sections ofwhich only the upper one will be looped around by a thread. While withthis arrangement the spindle itself is not looped around by the .thread,the construction of this arrangement is already in view of theadditional traveler, relatively complicated and expensive.

'It is, therefore, an object of the present invention to provide athread braking arrangement which will overcome the above-mentioneddrawbacks.

It is another object of this invention to provide an improved threadbraking arrangement in which the thread coil or helix will be limited tothe inserted shank.

These and other objects and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawing, in which:

FIGURE 1 diagrammatically illustrates a side view of a spindle with athread braking arrangement according to the invention placed thereon.

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FIGURE 2 represents a modified thread braking arrangement according tothe present invention.

FIGURE 3 is a section through still another modification of theinvention.

The thread braking arrangement according to the present invention ischaracterized primarily in that the carrier of the braking arrangementis mounted on a shank inserted into the spindle. The diameter of saidshank is preferably less than onethird of said spindle, so that in viewof the step between the shank and the spindle protruding from the bobbinsleeve, the thread will helically loop around said shank only.-

Referring now to the drawing in detail, and FIG. 1 thereof inparticular, the arrangement illustrated in FIG. 1 is such that thethread 1 passes in customary manner from the pair of delivery rollers 2.through the pig-tail 3 to the carrier crown or thread guiding means 4 ofthe thread braking device which is mounted on a shank 5 inserted intothe spindle 6 so as to rotate therewith. To this end, the member 4 may,'for instance, consist of one piece with the shank 5, or may be pressfitted thereon, or may in any other suitable way be connected to shank5. Shank 5 has a diameter which is less than one-third of the spindlediameter, so that between shank 5 and spindle 6 a considerable step 6ais obtained over which the thread -1 has to slide after being loopedaround the shank 5. Therefore, the thread 1 will, from said step 6a tothe traveler 7, form a balloon and will then at 8a be wound upon thebobbin sleeve 8.

The diameter of the carrier crown or thread guiding means 4 is from 2 to5 times greater than the diameter of the shank, so that the diameters ofthe carrier crown, of the shank and of the spindle, or, if the brakingdevice is provided with a special foot, also the diameter of such foot,will be within the limits of the ratios of from 2: l :3 to 5:1:10.

The carrier crown or thread guiding means 4 with the thin shank 5 isdetachable from spindle6, and if desired, the carrier crown may alsoitself be detachable from shank 5.

It is advantageous to so design the shank 5 that it tapers toward thespindle so that thread loops which might have formed, for instance, inthe balloon during a thread brake, can easily be stripped off whenpulling out the shank. With thread brakes which bring about a looping ofthe thread around the spindle or an upper member firmly connected to thespindle, it is, in such instances, rather cumbersome to wind off thethread, or such undesired thread loops have to be eliminated by means ofa sharp tool.

It is by no means imperative that the considerable step between shankand spindle diameter is at a right angle to the spindle axis. It israther possible, as shown in FIG. 2, to shape the step between shank 5and spindle 9 in form of a cone 9a.

FIG. 2 also shows more clearly the design of the carrier crown 4. Aswill be seen in particular from FIG. 2, the carrier crown has grooves 4awhich are substantially parallel to the axis of shank 5, as isparticularly clearly illustrated in the section through the crown ofFIG. 3. The step from the carrier crown to the shank may likewise beformed by a conical surface of said crown, while the top side may beplane.

The taper at the portions where the surface of crown 4 merges with thesurface of shank 5 and/ or where the surface of shank 5 merges with thesurface of spindle 9 amounts to at least Instead of inserting the shankwith the crown directly into the head of the spindle, it is alsopossible to provide the foot portion of the braking device with a cap tobe placed upon the spindle head. Such an arrangement is shown, forinstance, in FIG. 3. As will be seen from FIG. 3, the foot or bottomportion of the braking device is provided with a cap 13 which is pressedupon the head or upper portion of spindle 10. The outer diameter of thiscap 13 is somewhat less than the smallest inner diameter of the bobbinsleeve 14. Thus, according to the arrangement of FIG. 3, the upperportion of spindle It) does not contact the bobbin sleeve 14.

As will furthermore be evident from FIG. 3, a ring 1?. of an elasticmaterial, as, for instance rubber, is inserted between cap 13 and thehead of spindle 10. This ring serves as friction coupling between'thespindle it) and cap 13 on one hand, and shank 5 on the other hand. Tothis end, the inner diameter of ring 12 is slightly less than the outerdiameter or; shank 5.

In connection with all embodiments of the invention, it isimportant thatthe step 6a, ha is located above the upper bobbin sleeve edge to asuflicient extent. With the ierctofore known spindles, the spindle headis usually located a few millimeters or centimeters below the upperbobbin sleeve edge. As will be seen from FIG. 1, with the arrangement ofthe invention, the upper edge of the bob-bin sleeve 3 is locatedconsiderably below the step 6a so that thread 1 cannot be 'afiected byth upper edge of the bob-bin sleeve. The same remarks also apply to theembodiment of H6. 3. According to the embodiment of FIG. 3, the upperedge of the bobbin sleeve is located approximately at the centralportion of cap 13.

With the heretofore known thread braking arrangements, no stable guidingof the thread is obtained be tween the braking device and the traveller,because a fluctuation occurs between the fully formed balloon and thefully formed helix or thread loop, which fact is harmful to the entirespinning process. In contrast thereto, as will be obvious from theabove, with the braking arrangement according to the present invention,the thread loop will be permanently limited to the inserted shank 5.

It is, of course, to be understood, that the present invention is, by nomeans, limited to the particular con struction shown in the drawing, butalso comprises any modification within the scope of the appended claims.

What I claim is:

1. In a thread braking device for ring spinning and ring twistingmachines, a rotatable spindle adapted to receive and rotate a bobbinsleeve, a shank inserted into the upper end portion of said spindle forrotation therewith, and means connected to said shank in spacedrelationship to the upper end portion of said spindle for receiving athread and passing the same around said shank and over the upper edge ofsaid spindle, said shank having a diameter less than a third of thediameter of the adjacent spindle end, whereby said shank forms aconsiderable step with said adjacent spindle end.

2. A thread braking device according to claim 1, in which that diameterportion of said shank which is ad jacent said upper spindle end portionis approximately one-third of the diameter of said adjacent spindle endportion.

3. In a thread braking device, for ring spinning and ring twistingmachines, a rotatable spindle adapted to receive and rotate a bobbinsleeve, a shank inserted into a 4 the upper end portion of said spindlefor rotation therewith, and notched crown shaped means connected to saidshank for rotation therewith and arranged in spaced relationship to theupper end portion of said shank for receiving a thread and passing thesame around said shank and over the upper edge of said spindle, saidshank having a diameter less than one third hr the diameter of theadjacent spindle end, whereby said shank forms a considerable step withsaid adjacent spindle end, and said notched crown shaped means having adiameter at least twice the diameter of the adjacent shank portion.

4-. A thread breaking device according to claim 1, in which said shanktapers toward the adjacent end of said spindle,

5. In a thread braking device for ring spinning and ring twistingmachines, a rotatable spindle adapted to receive and rotate a bobbinsleeve, a shank inserted into the upper end portion of said spindle forrotation therewith, the upper portion of said spindle including capmeans surrounding a portion of said shank and being ring twistingmachines, a rotatable spindle adapted to receive and rotate a bobbinsleeve, a shank inserted into the upper end portion of said spindle forrotation therewith, the upper portion of said spindle including invertedcup shaped cap means with a bottom and a skirt connected thereto, saidbottom surrounding a first shank portion in spaced relationship to thelower end portionof said shank, and said skirt surrounding the lower endportion of said shank, coupling means adjacent the bottom of said capmeans and frictionally engaging the same and said shank, and crownshaped means arranged above said cap means in axially spacedrelationship thereto and connected to said shank for rotation therewithto receive a thread and passing the same around the shank portionbetween said cap means and said crown shaped means and over the upperedge of said bot-tom of said cap means.

7. A device according to claim 6, in which said coupling means consistof a ring of an elastic material having an inner diameter less than theouter diameter of the shank portion surrounded thereby.

References Cited in the file of this patent UNITED STATES PATENTS2,041,918 Freund May 26, 1936 2,217,371 Kowarick Oct. 8, 1940 2,622,388Roeder Dec. 23, 1952 FOREIGN PATENTS 531,070 Italy July 21, 1955

1. IN A THREAD BRAKING DEVICE FOR RING SPINNING AND RING TWISTINGMACHINES, A ROTATABLE SPINDLE ADAPTED TO RECEIVE AND ROTATE A BOBBINSLEEVE, A SHANK INSERTED INTO THE UPPER END PORTION OF SAID SPINDLE FORROTATION THEREWITH, AND MEANS CONNECTED TO SAID SHANK IN SPACEDRELATIONSHIP TO THE UPPER END PORTION OF SAID SPINDLE FOR RECEIVING ATHREAD AND PASSING THE SAME AROUND SAID SHANK AND OVER THE UPPER EDGE OFSAID SPINDLE, SAID SHANK HAVING A DIAMETER LESS THAN A THIRD OF THEDIAMETER OF THE ADJACENT SPINDLE END, WHEREBY SAID SHANK FORMS ACONSIDERABLE STEP WITH SAID ADJACENT SPINDLE END.